Marine Terraces and Tectonic Uplift along the Echizen Coast, Fukui Prefecture, central Japan.

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  • 越前海岸に発達する海成中位段丘群の対比と隆起速度
  • エチゼン カイガン ニ ハッタツスル カイセイ チュウイ ダンキュウグン ノ

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Abstract

Marine terraces along the Echizen Coast on the Sea of Japan side of central Japan have been investigated with special reference to their tectonic uplift during the late Pleistocene period. A large part of the Echizen Coast consists of a flight of marine terraces which are classified into three groups called the Holocene terrace, the middle terrace group, and the higher terrace group. The middle terrace group is further subdivided into three terraces, named M1, M2, and M3 in descending order of elevation. M1 and M2 have wide surfaces, and M3 has narrow surfaces in places between the M2 and the Holocene terraces.<br>Some tephras obtained from the terrace deposits and from the topsoil covering them are identified with the Sambe Kisuki tephra, the Kikai-Tozurahara tephra, the Aso-4 tephra, the Daisen Kurayoshi tephra, the Aira-Tn tephra, and the Kikai-Akahoya tephra. These tephras and topographic features show that M1 can be correlated with the Shimosueyoshi terrace, M2 with the Obaradai terrace, and M3 probably with the Misaki terrace in the southern Kanto area.<br>The average uplift rates along the Echizen Coast are calculated, based on the height of the former shorelines preserved on these terrace surfaces, the age of these formed terraces, and the paleo-sealevel height, to be 0.2 to 0.5 meter per 1, 000 years in the northern area, 0.6 to 0.9 meter per 1, 000 years in most other areas, and the highest rate of 1.0 to 1.2 meters per 1, 000 years at the northeast end of the Cape of Echizen. These high rate of tectonic uplift of the Echizen Coast seems to be related to the activity of the Kaburagi Fault along the coast.

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